Winning of tin



No Drawing.

T 0 all to lwntz't may concern Be it known thatI, Hits, a subject of the King of Great'Britain and Ireland, and resident of- Mossdiel found that if dry chlorine gas be caused to act directly on tin bearing rock itself W1th- I so out'any mechanical concentration of the tin' oxide therein and separation of the same from the gangue, so that the amount of tin in the material may be but four per cent or less, then the heat generated during the reaction is maintained within controllable limits and the process is rendered commercially practicable.

lVIy invention comprises the direct treat ment of the tin bearing rock orof the tailings left after the mechanical extraction of tinoxide from the rock, after the reduction of the oxide in the known manner, to the acthe chlorine and the metal occurs may be jacketed and a cooling medium circulated through the jacket to maintain approxr tion of dry chlorine gas whereby stannic chloride is produced from which metallic 'tinis obtained.

- In one convenient application of my'in- 'vention, the tin bearing rock is crushed and subjected to-the action of reducing gas at a suitable temperature for converting the tiuoxide which the rock contains into metallic tin. No mechanical concentrations of the metal or separation of the same from the gangue is effected but the jvvhole of they material that is the tin bearing rock after the reduction process) is suhjected'tothe action of dry chlorine gas whereby stannic chloride, which is liquid at ordinary tem-' The chloride is evaporated from the mass of material, gpre'ferably under a reduced to pressure or by blowing-air on the heated mass, and is subsequently condensed and converted into hydrated chloride by dissolving in Water or collecting over Water.- 01

the tin chloride may be removed by a suitable solvent such as warm Water, steam or caustic soda solution.

- I Specification of Let-tersPatent, 1 App lication filed November 1, 1929.; seria infrgigrsiflfj JEROME JOHN COL.

1 free from tin.

'JERoMn JOHN. oomms, or sou'riiron'r, ENeLANn.

WINNING or UNITED The tin maybe isolated from thechloride by various means but preferably by replace; ment of the tin by= zinc,fyielding tin-and zinc chloride in the knownmanner." For such method of recovery, the hydrated chloride is passed overzinc, which may be in the.

form of turnings or otherscrap'.

prevent precipitation of the tin as oxychlo- The tin V .is yielded in the form'ofspongy tin. To

ride, thetin chloride solution is preferably 1 1 warmed and passed througha series ofboxes containing zinc; In thefi'rst box of the.

series, there will be an excess. of tin in the solution; in'the last box of the series there will be an excess'ofzinc bothin the solution and the box, thereby giving a zinc chloride The. solution is treated or used over again to absorb the tinchloride and to bring up the strength ofthe solu-.

tion to reduce the amount'of .evaporationnecessary to bring the zinc chloride to a marketable condition.

The spongy tin is carefully driedand v meltedfinto ingots.

Thevessel in whlch the reaction'between mately atmospheric temperature in the: vessel during the reaction, to prevent'the formation of chlorides or other metals that may be present in the ore and which'would contaminate the tin chloride. Such cooling; permits of the use of-a castior wrought} iron reaction vessel. 1

For starting the reaction when working under low temperature conditions, a small,

amount of tin chloridef (SnC ,4) is added 'to the rock before the 'densed as aforesaid and the resulting liquid treated in. any convenient and known mannor for obtaining the required s'alts in a" commercial form.

If the tin bearing rock contains sulphides Y or arsenides of iron, it is roasted or calcined to remove the sulphur and arsenicbefore the reductionprocess before referred to.

By the process before described, i only. render the winning of metallic tin by I the use of chlorine gas commercially possible, but I dispense withthe costly and laborious mechanical concentrating opera-.

tions now usual in pr'derto obtain anor'e containing vupwards of 60 per cent of meing the said'tin bearing materiah reducing 10 tallic tin, thereby providing a simple and the (Hide therein to metallic tin, and subeoonomical process. r i v I v:irjecting the entire mess tol the action o-f'ohlo- Having now described my invention, What rine whereby the tin'is liquated asxstannic 5 I claim as new and desire torsecure hyLet chloride,- as set forth.

, ters Patent is: In testimony whereof I have SigIlQdl Dy 15 A process forithe reeoveryor Winning of name to this specification. tin from rock or material eonta nlng tin in the form of tin oxide, consisting in'cruSh- V JEROMEJOHN oonnrnsif i 

